blob: dd72c83b416520b6277f057c9589fb3d836656ef [file] [log] [blame]
/*
* Copyright 2021 Google LLC.
* SPDX-License-Identifier: Apache-2.0
*/
#ifndef DRIVERS_SYSCON_SYSCON_COMMON_H_
#define DRIVERS_SYSCON_SYSCON_COMMON_H_
#include <sys/util.h>
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief Align and check register address
*
* @param reg Pointer to the register address in question.
* @param reg_size The size of the syscon register region.
* @param reg_width The width of a single register (in bytes).
* @return 0 if the register read is valid.
* @return -EINVAL is the read is invalid.
*/
static inline int syscon_sanitize_reg(uint16_t *reg, size_t reg_size, uint8_t reg_width)
{
/* Avoid unaligned readings */
*reg = ROUND_DOWN(*reg, reg_width);
/* Check for out-of-bounds readings */
if (*reg >= reg_size) {
return -EINVAL;
}
return 0;
}
#ifdef __cplusplus
}
#endif
#endif /* DRIVERS_SYSCON_SYSCON_COMMON_H_ */